How many chill hours does 77420 get?

77420 averages 356 chill hours per winter, ranging from 139 to 488 across the last 10 years.

What hardiness zone is 77420?

77420 is in USDA hardiness zone 9b.

Location almanac

The short answer

77420 averages 356 chill hours per winter (139–488 across 10 years) in USDA zone 9b.

77420 climate
Average chill hours	356 (139–488 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 8 – February 20
First fall frost	typically November 13 – December 23

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 77420’s chill hours and zone:

Chill and zone requirements are comfortably met in 77420.

Show 26 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 77420 get?: 77420 averages 356 chill hours per winter, ranging from 139 to 488 across the last 10 years.
What hardiness zone is 77420?: 77420 is in USDA hardiness zone 9b.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026